I was looking at Sally's Hill house towel project - the second slide reminded me of an important ritual at the first "vävstuga" I attended: whemever someone had cut off, s/he unwound the web from the cloth beam in such a way that all the warp sticks fell to the floor with a clatter. On hearing the noise, everybody present immediately went to look/admire the cloth.
There is also an old (ie described in some books) tradition to have "happy hole coffee" when first you can see the "happy hole" - that is, when you first can see the naked warp beam. (A Swe weaving blogger has started to give recipes for "happy hole cakes" - she has auto-translation for non-Swe readers, but be aware that auto-translation sometimes can give VERY odd results - ) - An old superstition says that once you have see the happy hole you have to weave the warp off in one sitting - or else... (what? the book dosen't say)
Are there any other rituals/superstitions out there?